7171479721 has 6 divisors (see below), whose sum is σ = 8342333610. Its totient is φ = 6146982576.

The previous prime is 7171479709. The next prime is 7171479743. The reversal of 7171479721 is 1279741717.

It can be written as a sum of positive squares in only one way, i.e., 3691777600 + 3479702121 = 60760^2 + 58989^2 .

It is not a de Polignac number, because 7171479721 - 2⁷ = 7171479593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7171479521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73178316 + ... + 73178413.

It is an arithmetic number, because the mean of its divisors is an integer number (1390388935).

Almost surely, 2^7171479721 is an apocalyptic number.

It is an amenable number.

7171479721 is a deficient number, since it is larger than the sum of its proper divisors (1170853889).

7171479721 is a wasteful number, since it uses less digits than its factorization.

7171479721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146356743 (or 146356736 counting only the distinct ones).

The product of its digits is 172872, while the sum is 46.

The square root of 7171479721 is about 84684.5896311720. The cubic root of 7171479721 is about 1928.4257631971.

The spelling of 7171479721 in words is "seven billion, one hundred seventy-one million, four hundred seventy-nine thousand, seven hundred twenty-one".